There was an error while completing the setup process

Can’t download/install Avast. Tried the current Free, and free Beta version. The stub downloads and runs. The setup process fails. From the setup log:

2015-12-29 19:34:20Infopkgproduct[6404,2620]LoadPartInfo: vps = vps_win32-15122902 returned 0x00000000
2015-12-29 19:34:20Infopkgengine[6404,2620]LoadLatestProdAndParts: product file ‘prod-vps.vpx’ was successfully loaded.
2015-12-29 19:34:20Infoservers[6404,2620]ChooseServer: selected server ‘Download l3179313 AVAST9 Server’ with current url ‘http://l3179313.ivps9x.u.avast.com/ivps9x’ of type ‘URL_TYPE_DOWNLOAD_VPS’.
2015-12-29 19:34:20Errordldwrap[6404,2620]GetFileWithRetry: file ‘C:\Users\xxx\AppData\Local\Temp_av_iup.tm~a04608\part-iex-5.vpx’ has been downloaded but it has invalid signature. Next try: 1

2015-12-29 19:34:39Infoservers[6404,2620]ChooseServer: selected server ‘Download r7579564 AVAST9 Server’ with current url ‘http://r7579564.ivps9x.u.avast.com/ivps9x’ of type ‘URL_TYPE_DOWNLOAD_VPS’.
2015-12-29 19:34:41Errorpkgengine[6404,2620]DownloadPackage(download): ‘C:\Users\xxx\AppData\Local\Temp_av_iup.tm~a04608\part-iex-5.vpx’, ip: 23.67.242.9, has failed with code: 40961 (0x0000A001) [Invalid signature]
2015-12-29 19:34:41Errorpkgengine[6404,2620]LoadLatestProdAndParts: part file part-iex-5.vpx could not be downloaded. Status: 40961 (0x0000A001) [Invalid signature]

I’ll try again tomorrow.

https://forum.avast.com/index.php?topic=181035.msg1280278#msg1280278

Supposedly resolved, response from an avast team member: